:root {
  --page: #1e1e1e;
  --text: #eef2ff;
  --muted: #cad3eb;
  --ink: #0c1222;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: "Manrope", ui-sans-serif, system-ui, -apple-system, sans-serif;
  background: var(--page);
  color: var(--text);
  position: relative;
}

.github-btn {
  position: absolute;
  top: clamp(14px, 2.2vw, 26px);
  right: clamp(14px, 2.2vw, 26px);
  z-index: 5;
  display: grid;
  place-items: center;
  align-items: center;
  text-decoration: none;
  color: #ffffff;
  background: #1e1e1e;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  width: 64px;
  height: 64px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.32);
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.github-btn svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.github-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.36);
}

.viewport {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: clamp(12px, 2.2vw, 28px) clamp(12px, 2.2vw, 28px);
}

.hero-card {
  width: 100%;
  height: 100%;
  border-radius: 28px;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.48);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url("img.png") center / cover no-repeat;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(159, 178, 255, 0.26) 0%,
    rgba(112, 133, 242, 0.2) 52%,
    rgba(116, 103, 199, 0.24) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 22px;
  padding: clamp(20px, 4vw, 50px);
}

.hero-icon {
  width: clamp(96px, 10vw, 138px);
  height: clamp(96px, 10vw, 138px);
  border-radius: 0;
  object-fit: cover;
  box-shadow: none;
}

h1 {
  margin: 2px 0 0;
  font-family: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(44px, 8vw, 94px);
  line-height: 1;
  letter-spacing: -0.035em;
  color: #080a10;
}

p {
  margin: 4px 0 0;
  max-width: 880px;
  font-size: clamp(16px, 2.1vw, 34px);
  line-height: 1.42;
  color: rgba(9, 12, 22, 0.9);
}

.actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.install-picker {
  display: block;
  position: relative;
  width: 320px;
  max-width: 100%;
}

.install-toggle {
  width: 100%;
  min-height: 60px;
  position: relative;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: linear-gradient(145deg, rgba(20, 20, 23, 0.88), rgba(12, 12, 14, 0.92));
  color: #f6f8ff;
  font-family: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(15px, 1.2vw, 19px);
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 14px 30px rgba(4, 5, 8, 0.42);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.install-toggle:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 18px 34px rgba(4, 5, 8, 0.5);
}

.install-toggle-text {
  display: inline-flex;
  align-items: center;
  white-space: normal;
  line-height: 1.2;
  justify-content: center;
}

.install-toggle-content {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.install-caret-wrap {
  min-width: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-right: 0;
}

.install-caret {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform 160ms ease;
}

.install-picker[data-open="true"] .install-caret {
  transform: translateY(2px) rotate(-135deg);
}

.install-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  padding: 8px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(145deg, rgba(26, 26, 29, 0.98), rgba(12, 12, 14, 0.98));
  box-shadow: 0 18px 36px rgba(4, 5, 8, 0.5);
  display: none;
  z-index: 10;
}

.install-picker[data-open="true"] .install-menu {
  display: grid;
  gap: 8px;
}

.install-option {
  width: 100%;
  min-height: 44px;
  border-radius: 12px;
  border: none;
  background: transparent;
  color: #edf2ff;
  font-family: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(14px, 0.95vw, 15px);
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 10px 12px;
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: background-color 160ms ease, color 160ms ease;
}

.install-option-icon {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
  opacity: 0.92;
}

.install-option-label {
  min-width: 0;
  flex: 1;
}

.install-option:hover {
  background: rgba(255, 255, 255, 0.1);
}

.install-option-capsule {
  margin-left: 10px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(245, 249, 255, 0.92);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  white-space: nowrap;
}

.install-option:focus-visible,
.install-toggle:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.95);
  outline-offset: 2px;
}

.install-option.is-selected {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

.btn {
  text-decoration: none;
  border-radius: 999px;
  padding: 16px 30px;
  min-height: 60px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(15px, 1.25vw, 20px);
  font-weight: 700;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

.btn-primary {
  background: linear-gradient(135deg, #2a2a2a 0%, #222222 60%, #1e1e1e 100%);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 16px 34px rgba(4, 5, 8, 0.48);
}

  .btn-secondary {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(229, 237, 255, 0.9));
  color: #0a1329;
  border-color: rgba(12, 18, 34, 0.24);
  box-shadow: 0 14px 28px rgba(6, 10, 22, 0.22);
}

.site-footer {
  position: absolute;
  left: 0;
  right: 0;
  bottom: clamp(10px, 1.8vw, 20px);
  z-index: 3;
  text-align: center;
  pointer-events: none;
}

.site-footer p {
  margin: 0 auto;
  max-width: none;
  font-size: 12px;
  color: rgba(234, 240, 255, 0.85);
  letter-spacing: 0.02em;
  text-align: center;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary:hover {
  box-shadow: 0 20px 40px rgba(4, 5, 8, 0.55);
}

.btn-secondary:hover {
  background: linear-gradient(145deg, rgba(255, 255, 255, 1), rgba(236, 242, 255, 0.98));
  border-color: rgba(12, 18, 34, 0.32);
  box-shadow: 0 18px 34px rgba(6, 10, 22, 0.26);
}

#instructions-btn {
  white-space: nowrap;
}

.btn:active {
  transform: translateY(0);
}

.btn:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.95);
  outline-offset: 2px;
}

.custom-alert {
  position: absolute;
  left: 50%;
  bottom: clamp(44px, 6vw, 74px);
  transform: translateX(-50%) translateY(12px);
  z-index: 6;
  width: min(620px, calc(100% - 32px));
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: linear-gradient(145deg, rgba(22, 22, 26, 0.96), rgba(11, 11, 14, 0.96));
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.custom-alert.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.custom-alert-icon {
  width: 18px;
  height: 18px;
  color: #dce7ff;
  flex: 0 0 18px;
}

.custom-alert-message {
  margin: 0;
  max-width: none;
  color: rgba(238, 244, 255, 0.92);
  font-size: 15px;
  line-height: 1.35;
  text-align: left;
  flex: 1;
}

.custom-alert-close {
  width: 30px;
  height: 30px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: transparent;
  color: #e8eeff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex: 0 0 30px;
}

.custom-alert-close:hover {
  background: rgba(255, 255, 255, 0.1);
}

.custom-alert-close svg {
  width: 14px;
  height: 14px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 720px) {
  html,
  body {
    overflow: auto;
  }

  .viewport {
    min-height: 100dvh;
    height: auto;
    padding: 10px;
  }

  .hero-card {
    border-radius: 18px;
    min-height: calc(100dvh - 20px);
  }

  .hero-icon {
    border-radius: 0;
    width: clamp(82px, 19vw, 106px);
    height: clamp(82px, 19vw, 106px);
  }

  h1 {
    font-size: clamp(34px, 12vw, 58px);
  }

  p {
    font-size: clamp(15px, 4.2vw, 20px);
    line-height: 1.35;
  }

  .github-btn {
    top: 12px;
    right: 12px;
    width: 52px;
    height: 52px;
  }

  .github-btn svg {
    width: 20px;
    height: 20px;
  }

  .actions {
    width: 100%;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: stretch;
    gap: 10px;
  }

  .btn {
    width: 100%;
    text-align: center;
    padding: 14px 14px;
    min-height: 56px;
    font-size: clamp(13px, 3.2vw, 15px);
  }

  .install-picker {
    width: 100%;
  }

  .install-menu {
    width: 100%;
  }

  .install-caret-wrap {
    min-width: 28px;
  }

  .custom-alert {
    bottom: 70px;
    width: calc(100% - 24px);
    padding: 12px 14px;
  }

  .custom-alert-message {
    font-size: 14px;
  }
}

@media (max-width: 520px) {
  .hero-content {
    gap: 16px;
    padding: 20px 14px 42px;
  }

  .actions {
    grid-template-columns: 1fr;
  }

  #instructions-btn {
    font-size: 13px;
  }

  .site-footer {
    bottom: 8px;
  }
}